Mixing pump



Dec. 4, 1956 D. B. HARNEY ETAL MIXING PUMP Filed Aug. 30. 1954 Il. w w

D ya 5H www MAH WHS. 6.0 N mm@ RU OB D u. W

w M Qwn WH me TT n s fm 1 H we K 6K Q/Vv E M H United States Patent Oice MIXING PUMP Doran B. Harney, Compton, and-,Wilburn 0. Shepherd,

Whittier, Calif., assignors to Pacific Pumps, Inc., Huntington Park,Calif.,'a corporation of California Application August 30, 1954, serialNo. 453,052

1 claim. (ci. 259-7) The present invention relates in general to pumpsand, more particularly, to a pump for intimately mixing two liquids, orother fluids.

The present invention finds particular utility in treaters for mixingfresh stock with the stock in the treaters, although the utility of theinvention is not necessarily limited thereto.

The primary object of the invention is to provide a mixing pump whichincludes pumping means for propelling a first fluid through a flowchannel in a pump housing, and which includes an apertured distributingpassage spanning the flow channel for injecting a second fluid into thefirst fluid as it is propelled through the flow channel by the pumpingmeans, the apertures in the distributing passage facing in thedownstream direction with respect to the direction of flow through theflow channel.

AMore particularly, an object of the invention is to provide a mixingpump which includes a housing having an annular flow channeltherethrough, which includes pumping means in the housing for propellingthe first fluid through the annular channel, and which includes meansforming a plurality of radial distributing passages spanning the annularchannel, the passage-forming means having a plurality ofdownstream-facing apertures therein which communicate with the radialdistributing passages and with the annular channel to inject the secondfluid into the stream of first fluid propelled through the annularchannel, thereby attaining intimate mixing of the two fluids, which isan important feature of the invention.

Another object of the invention is to provide a central supply passagein the pump housing which is encompassed by the 'annular channel andwhich communicates with the radial distributing passages to supply thesecond fluid thereto.

Another object is to provide a mixing pump wherein the radialdistributing passages are formed by radial tubes spanning the annularchannel, these tubes having apertures therein which face in thedownstream direction to inject the second fluid into the stream of firstfluid flowing through the annular channel.

Another object is to provide a mixing pump wherein the annular channelis bounded by inner and outer walls, the inner wall separating thecentral supply passage from the annular channel and having thereinradial holes into which the radial distributing tubes are threaded.

Another object is to provide a mixing pump wherein the radialdistributing tubes extend outwardly to the exterior of the housingthrough holes in the outer wall of the annular channel, sealing meansbeing provided between such outer wall and the radial distributingtubes.

The foregoing objects, advantages and features of the 5 2,772,863Patented Dec. 4, 1956 present invention, together with various otherobjects, advantages and features thereof which will become apparent, maybe attained with the exemplary embodiment of the invention which isillustrated in the accompanying drawing and which is described in detailhereinafter. Referring to the drawing;

Fig. l is a longitudinal sectional view of the Ymixing pump of theinvention; and

Fig. 2 is a transverse sectional view taken along the arrowedline 2-2 ofFig. 1.

Referring to the drawing, the numeral 10 designates a housing whichprovides an anular flow channel 11 bounded by inner and outer walls 12and 13. The mixing pump of the invention includes a pumping means 14 forpropelling a first fluid through the annular channel 11 in the directionof the arrow 15, the pumping means 14 including an impeller 16 mountedon a shaft 17 in suitable bearings in the housing 10. In the particularembodiment illustrated, the housing 10 is adapted to be inserted belowthe level of liquid stock in a treater, for example, to draw the liquidstock upwardly through the annular channel 11 in the direction indicatedby the arrow 15, the liquid stock being discharged from the housing 10through ports 19 therein.

The housing 10 provides an inner supply passage 21 for a second fluid,such as fresh liquid stock, to be injected into the annular stream offluid flowing through the channel 11, the central supply passage Z1communicating with an inlet 22 through which the second fluid isintroduced. The inner wall 12 of the annular channel 11 separates thischannel from the central supply passage 21 and is provided with aplurality of radial holes 23 therein into which are threaded the innerends of radial distributing tubes 24. The latter are provided withdown-stream-facing apertures 25 therein through which the second fluidfrom the central supply passage 21 is injected into the fluid streamflowing through the annular channel 11, injecting the second fluid intothe fluid stream flowing through the channel 11 in this manner through alarge number of apertures 25 producing intimate mixing of the twofluids, which is an important feature of the invention.

The distributing tubes 24 extend outwardly through the outer wall 13 vofthe annular channel 11 through radial holes 27, gaskets 28 retained bylock nuts 29y preventing leakage.

For applications of the invention designed to handle: acidic liquids,the distributing tubes 24 are provided with drain apertures 31, thecentral supply passage 21 alsol being provided with one or more drainapertures 32. Thus, when the mixing pump is not in use, any liquids:therein may drain to prevent corrosion in the event that acidic liquidsare being handled. t

Although we have disclosed an exemplary embodiment of our inventionherein for purposes of illustration, it will be understood that variouschanges, modifications and substitutions may be incorporated in suchembodiment without departing from the spirit of the invention as definedby the claim hereinafter appearing.

We claim as our invention:

In a mixing pump, the combination of: a hollow generally cylindricalhousing defining a flow channel for a fluid; a tubular supply conduitfor a second fluid extending axially of said flow channel and havingthreaded radial openings in the side wall thereof; means xedlysupporting said conduit in said housing; openings through ing with theinterior of said conduit, said tubes extend` ing outwardly through saidopenings in said housing and having closed end portions outside saidhousing; sealing means between said tubes and the outside of saidhousing and means on siadr, tubes, outside said housing, retaining saidsealing means in place; openings in the side walls of said 'tubes withinsaid housing and facing axially of said ow vchannel in one direction; ashaft journalled in said tubular ltonduit and extending from an `endthereof insaid housing; and axial-110W pumping vmeans mounted on saidshaft in said housing upstream of said tubes for pumping said fluidthrough said flow channel in said one-direetion- References Cited in thele of this patent UNITED STATES PATENTS Marshall Jan. 8, Hulst et al.Aug. 2, Oliphant Dec. 20, Bergdoll Sept. 11, Snyder Aug. 13, 13u11 Nov.4, Benning Mar. 25, Aldridge Nov. 18, Eweson Apr. 22,

FOREIGN PATENTS Italy Apr. 5, 'Germany July 21, l

Germany Nov. v14,

